Rivas-Ubach A, Sardans J, Pérez-Trujillo M, Estiarte M, Peñuelas J (2012) Una nova ciència per entendre els ecosistemes: l'ecometabolòmica. Omnis Cellula 28: 5.
Rivas-Ubach A, Sardans J, Pérez-Trujillo M, Estiarte M, Peñuelas J (2012) Strong relationship between elemental stoichiometry and metabolome in plants. Proceedings of the National Academy of Sciencies 109: 4181-4186.
Carter M.S., Larsen K.S., Emmett B., Estiarte M., Field C., Leith I.D., Lund M., Meijide A., Mills R.T.E., Niinemets Ü., Penuelas J., Portillo-Estrada M., Schmidt I.K., Selsted M.B., Sheppard L.J., Sowerby A., Tietema A., Beier C. (2012) Synthesizing greenhouse gas fluxes across nine European peatlands and shrublands-responses to climatic and environmental changes. Biogeosciences. 9: 3739-3755.LinkDoi: 10.5194/bg-9-3739-2012
In this study, we compare annual fluxes of methane (CH4), nitrous oxide (N2O) and soil respiratory carbon dioxide (CO 2) measured at nine European peatlands (n=4) and shrublands (n=5). The sites range from northern Sweden to Spain, covering a span in mean annual air temperature from 0 to 16 °C, and in annual precipitation from 300 to 1300 mm yr.-1. The effects of climate change, including temperature increase and prolonged drought, were tested at five shrubland sites. At one peatland site, the long-term (> 30 yr) effect of drainage was assessed, while increased nitrogen deposition was investigated at three peatland sites. The shrublands were generally sinks for atmospheric CH4, whereas the peatlands were CH4 sources, with fluxes ranging from-519 to +6890 mg CH4-C mg-2 yr-1 across the studied ecosystems. At the peatland sites, annual CH4 emission increased with mean annual air temperature, while a negative relationship was found between net CH4 uptake and the soil carbon stock at the shrubland sites. Annual N2O fluxes were generally small ranging from ĝ̂'14 to 42 mg N 2O-N m-2 yr-1. Highest N2O emission occurred at the sites that had highest nitrate (NO3ĝ̂') concentration in the soil water. Furthermore, experimentally increased NO3ĝ̂' deposition led to increased N2O efflux, whereas prolonged drought and long-term drainage reduced the N2O efflux. Soil CO2 emissions in control plots ranged from 310 to 732 g CO2-C m-2 yr -1. Drought and long-term drainage generally reduced the soil CO 2 efflux, except at a hydric shrubland where drought tended to increase soil respiration. In terms of fractional importance of each greenhouse gas to the total numerical global warming response, the change in CO2 efflux dominated the response in all treatments (ranging 71-96%), except for NO3 addition where 89% was due to change in CH4 emissions. Thus, in European peatlands and shrublands the effect on global warming induced by the investigated anthropogenic disturbances will be dominated by variations in soil CO2 fluxes. © 2012 Author(s).
Llebot JE, Carnicer J, Curiel J, Coll M, Díaz de Quijano M, Estiarte M, Filella I, Garbulsky M, Jump A, Llusià J, Ogaya R, Peñuelas J, Rico L, Rivas-Ubach A, Rutishauser T, Sardans J, Seco R, Silva J, Stefanescu C, Terradas J (2012) Second report on climate change in Catalonia. Executive summary. Institut d'Estudis Catalans. Generalitat de Catalunya. pp. 1-36. ISBN9788499650975.
Peñuelas J, Filella I, Farré G, Owen S, Primante C, Rodrigo A, Martín A, Bosch J, Seco R, Porcar A, Llusià J, Greenberg J, Harley P, Rapparini F, Estiarte M, Mejia-Chang M, Ogaya R, Ibañez J, Sardans J, Turnipseed A, Geron C, Duhl T, Facini O, Baraldi R, Rapparini F, Guenther A (2012) BVOCs in the plant-pollinator market and other applications of ecology to betytyerunderstand BVOC emissions in the environment. BVOCs Gordon Conference, Biogenic Hydrocarbons & the atmosphere. Reaching across scales: from molecule to the globe. Bates College, Maine. June 24-29. Key note invited speaker.
Peñuelas J, Filella I, Estiarte M, Ogaya R, Llusià J, Sardans J, Jump A, Carnicer J, Rico L, Garbulsky M, Coll M, Díaz de Quijano M, Seco R, Rivas-Ubach A, Kefauver S, Barbeta A, Achoategui A, Mejía-Chang M, Gallardo A, Farre G, Fernández M, Terradas J (2012) Ecosystemic and biospheric interactions with carbon cycle. In Carbon dioxide budget: processes and tendencies symposium. Universitat Politècnica de Catalunya, May 23-25.
Estiarte M, Peñuelas J, Ogaya R (2012) Mediterranean shrubland and forest responses to experimental drought. Drought and ohter extreme weather conditions in terrestrial ecosystems. CLIMMANI European Science foundation. Dubrovnic. June 6-8.
Estiarte M, Peñuelas J, Ogaya R, Barbeta A (2012) Experimental drought experiments in Garraf and Prades. Results of long-term field experiments. In: Drought and other extreme weather conditions in terrestrial ecosystems, CLIMANI workshop. Dubrovnik, Croatia. June 6-8.
Nogués I., Peñuelas J., Llusià J., Estiarte M., Munné-Bosch S., Sardans J., Loreto F. (2012) Physiological and antioxidant responses of Erica multiflora to drought and warming through different seasons. Plant Ecology. 213: 649-661.LinkDoi: 10.1007/s11258-012-0029-1
Climate change projections forecast a warming and an associated change in the distribution and intensity of rainfalls. In the case of the Mediterranean area, this will be reflected in more frequent and severe drought periods in the future. Within a long-term (9 years) manipulation experiment, we aimed to study the effect of the soil drought (15-20% decreased soil moisture) and warming conditions (+1°C warming) projected for the next decades onto photosynthetic rates and water relations, and onto the antioxidant and anti-stress defense capacity of Erica multiflora, a common species of the dry Mediterranean coastal scrublands, in two different seasons, spring and summer. Results indicated that none of the applied treatments was severe enough to induce a pronounced negative response of photosynthesis in this species well adapted to harsh Mediterranean conditions, but also highlighted important seasonal differences. Photosynthesis was limited by photoinhibition in spring and by stomatal closure in summer. Isoprenoid emission and the level of enzymatic and non-enzymatic antioxidants were lower in summer than in spring, whereas pigment and total phenolic contents were generally higher in summer. Volatile isoprenoid emissions were largely inhibited by drought and were not stimulated by warming. Drought and warming increased the oxidation state of ascorbate and reduced total glutathione levels in spring, but not in summer. It is concluded that E. multiflora plants can adapt to prolonged drought and warming, at least at the level simulated by our manipulative experiment, through changes in the seasonal physiological and antioxidant response of leaves. © 2012 Springer Science+Business Media B.V.
Saura-Mas S., Estiarte M., Peñuelas J., Lloret F. (2012) Effects of climate change on leaf litter decomposition across post-fire plant regenerative groups. Environmental and Experimental Botany. 77: 274-282.LinkDoi: 10.1016/j.envexpbot.2011.11.014
Decomposition is a determining factor for the functioning of ecosystems because litter dynamics (litter fall and litter decomposition) constitute a key process in the regulation of the recycling of carbon and nutrients. We studied the litter decomposition properties of a set of 19 Mediterranean-basin woody species with different post-fire regenerative strategies (resprouters and non-resprouters), under experimental climate manipulation (simulating warming and drought) over a 2-year period. We show that climate change modifies litter decomposition of these Mediterranean woody species as litter contributions to the soil (g/year) were lower under drought experimental conditions. Species with different post-fire regeneration performance showed different leaf decomposition patterns, though these patterns were influenced by the taxonomical affiliation of the species. As expected, the mass loss of the non-resprouter litter, after 2 years, was higher than in resprouters. Non-resprouters showed higher nutrient concentration per mass of leaf litter after 2 years of experiment than resprouters, possibly because they have lost more C-rich biomass, allowing high nutrients concentration in the remaining litter. That would apply particularly to P as litter N:P ratio was lower in non-resprouters than in resprouters. This study suggests that, in Mediterranean ecosystems, nutrients' return from leaf litter to the soil will be slower under the projected future drier conditions. Furthermore, changes in fire regimes that lead to modifications in the abundance of post-fire regenerative groups are likely to affect ecosystem's functional properties. Thus, if new fire regimes enhance non-resprouters' abundance, we can expect a greater return of organic matter contributions to the soil and a lower litter N:P. © 2011 Elsevier B.V.
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